Popular Mechanics »10/29/08 4:40pm 10/29/08 4:40pm enlisted the help of Mythbuster Jaime Hyneman to answer that all-consuming transportation question: gas or electric? Using a collection of prototypes and production vehicles, the team set out to test compact cars, ATVs, motorcycles and go-karts head-to-head on-road and on the course to find out…